Question

doing more exercise helps you to keep healthy.有没

语法问题

Answer 1

doing more exercise helps you to keep healthy 是动名词短语作主语，但是后面却用了不定式 to keep healthy，不符合非谓语动词前后是对称结构的要求。应该作如下的修改：

-- Doing more exercise helps you keeping healthy经常进行更多的锻炼有助于你不断保持身体健康。【语法正确，但很少这样用】
-- To do more exercise helps you (to) keephealthy 进行更多的锻炼有助于你保持身体健康。【help 后的不定式一般要省略】
-- To do more exercise helps keep healthy. 进行更多的锻炼有助于保持身体健康。【最简练的结构】